Sorry, I'm not much help, but if it makes you feel better my 3 week old Barred Rocks have that coloring on their beaks too. They are from my pet chicken, they have been sexed, but that doesn't mean the "sexer" wasn't having a bad day.
Well thanks for the input. You said they were sexed? Male or females?
When I saw that, they were talking about parakeets or something so I am not going to get too nervous yet. But I am realllly hoping it will be a female so I can keep her, we have grown quite close